JEE MAIN - Physics (2003 - No. 24)
A strip of copper and another of germanium are cooled from room temperature to $$80K.$$ The resistance of
each of these decreases
copper strip increases and that of germanium decreases
copper strip decreases and that of germanium increases
each of these increases
Wyjaśnienie
The resistance of metal (like $$Cu$$) decreases with decrease in temperature whereas the resistance of a semi-conductor (like $$Ge$$) increases with decrease in temperature.